User model

rails generate model User name:string email:string
migration

bundle exec rake db:migrate
validates for name and email
limit length of name
format of email
case_sensitive: false
uniqueness of email

rails generate migration add_index_to_users_email
migration for email index

rake db:migrate
change email lower case
add gem bcrypt

for password
migration for password_digest

rails generate migration add_password_digest_to_users password_digest:string
after migration of add_password_digest_to_users
Make a basic User model

(including secure passwords)
Merge branch 'modeling-users'